Muffled pop safety-valve



(NoMode1.)-

A. O. MEADY.

MUPFLED POP SAFETY VALVE.

No. 452,230. Patented'May 12, 1891.

WITIJEESEE.

m: "Dims wcrsns co, FHDTO-LITHD., WASNINGYON, n. c.

UNITED STATES PATENT OFFICE.

ALBERT C. MEADY, OF SOMERVILLE, MASSACHUSETTS.

MUFFLED POP SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 452,230, dated May 12,1891.

Application filed December 10, 1890. Serial No. 374,181. (No model.)

To aZZ whom it may concern:

Be it known that I, ALBERT CECIL MEADY, a citizen of the United States,residing at Somerville, in the county of Middlesex and State ofMassachusetts,have invented certain new and useful Improvements inMuffled Pop Safety-Valves; and I do hereby declare the following to beafull, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to improvements in a muffled pop safety-valvewherein there is no back-pressure on the valve as the steam escapes.

My invention further relates to improvements in muffled popsafety-valves, by which I am enabled through suitable devices to applyto the valve the resilient force of the operating-spring by means of acentral bolt firmly secured at its lower end and having a steam-tightregulating-nut at its upper end, the valve being forced to its seat orrelieved through the operation of the said nut.

My invention further relates to the peculiar arrangement of a hollowcylindrical valve in which the operating-spring is inclosed, the upperend of the said valve being closed, while its lower end is left open forthe free entrance of the steam into the spring-chamher.

My invention further relates to the peculiar arrangement of a perforatedouter casing and baffling-plates in connection with the passage of thesteam through the valve and its escape into the atmosphere, by means ofwhich the noise of the issuing steam is muffled in a degree never beforeattained within my knowledge.

For the accomplishment of the objects herein set forth I employ themechanism illustrated in the accompanying drawings, in which- Figure 1is a vertical section of the instrument entire, and Fig. 2 a horizontalsection on the line 00 as, Fig. 1. I

Similar letters refer to st milar parts throughout the drawings.

To enable others skilled 111 the art to make and use my invention, 1will now proceed to describe its construction and operation, referencebeing had to the accompanying drawings, and to letters of referencemarked thereon.

The cylindrical valve-seating A is intertachmcnt to the steam-boiler,and at its extreme periphery it is provided at B with a screw-thread toreceive the lower end of the outer casing O, which is of a hollow,cylindrical, and domeshaped form, furnishing at its upper end at D aguide for the inclosed valve E, the lower end of which is guided bywings cast upon the metal of the valve atF. The tubular screw-threadedbolt 1 contains within it the tension-bolt H, and on the outside ofthese is mounted the operating-spring G, the ends of which are lodgedupon properlyformed washers '6, between which the spring is suitablycompressed and its force properly modified by screw-nut J. These twobolts are connected together by a transverse key, (shown at 7a,) uponwhich the lower washer rests, while the washer at the top of the springis secured by check-nut 7c. The key it is rigidly attached to the lowerend of bolt H, and a longitudinal slot in the tubular bolt I permits thebolt If and its key to slide up ward or downward.

The steam enters the spring-chamber freely, it being open at its lowerend to receive the spring, and the steam in making its escape passesover the valve-seat L, formed at the top of the valve-seating, into asmall annular chamber or cavity M, and thence into the outer chamber Nthrough a circumferential passage O,the opening through which isgoverned by a screw-ring P on the outside of the seating, where it issecured by a set-screw Q, inserted through the wall of the outer casing.

The outer chamber N is provided with two annular transverse partitions Sand T, both of which are perforated, the lower one being cast upon thebody of the valve and the upper one upon the interior surface of theouter casing, both having near contact with the wall opposite. Thedome-formed part of the outer casing at O is also closely perforatedwith steam-vents to break up still more completely the issuing steam inits final discharge into the atmosphere.

My improved safety-valve having been nally screw-threaded at its lowerend for at-- mounted, the spring is brought to proper tension bymanipulation of the steam-tight regulating -nut J. If the accumulatingsteampressure should exceed the prescribed limit, the spring will becompressed and the valve raised from its seat, allowing steam to escapeuntil only the desired pressure is retained. To modify the pressure, theregulating-nut J is turned, bringing a greater or less amount ofpressure on the valve. The valve is adjusted to loss of steampressnre indischarging by the variable ring P below the lip V of the valve.

Having thus described my invention, what I claim is 1. The combinationof a valve and its casing, the latter having steam-vents, a seatfor thevalve, and an opening, the valve protruding through such opening,whereby when steam operates the valve the steam passes through the ventsand the valve moves in the openin g without back-pressure, as set forth.

2. A hollow steam-valve, the valve-seating, and its casing, incombination with a spring within the valve, the latter interposedbetween the spring and the seating, as set forth.

3. The combination of the casing having steam-vents, and the flange T,provided with perforations, and the opening D, with the valve E,protruding through the opening D and having the flange S, provided withperforations, as set forth.

4. The combination of the valve-seating A, the casing 0, attachedthereto and having the opening D, and the valve E, having the wingguidesF seated in seat A and protruding through the opening D, as set forth.

5. The combination of the hollow valve E, the valve-seating A,thehollowbolt I, the solid bolt H within the bolt I, the spring G aroundthe bolt 1, and the nut J outside of the valve E and secured to the boltH, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT O. MEADY.

Witnesses:

JOSHUA H. MILLETT, DUDLEY P. BAILEY.

